public function __construct(IRestServer $server, $fileId, $fileName, $referenceNumber) { $this->fileName = $fileName; $page = Pages::RESERVATION_FILE; $qsAttachment = QueryStringKeys::ATTACHMENT_FILE_ID; $qsRefNum = QueryStringKeys::REFERENCE_NUMBER; $this->url = $server->GetUrl() . "/attachments/{$page}?{$qsAttachment}={$fileId}&{$qsRefNum}={$referenceNumber}"; }